Jolts From Mideast, Washington Break Calm on Street

Investors were jolted out of their tranquility this week, driving stocks to their first weekly decline in a month and sending oil prices to the biggest gain this year.

The sudden escalation of tensions in the Middle East and unexpected political upheaval helped drive down the Dow Jones Industrial Average by 0.9% for the week, retreating from a record close that it notched Tuesday. The S&P 500 lost 0.7%.